Giant spaceships appear over all major cities of the world, and Anna, the beautiful and charismatic leader of the extra-terrestrial “Visitors”, claims to come in peace. As a small number of humans begin to doubt the sincerity of the seemingly benevolent Visitors, FBI counter-terrorism agent Erica Evans discovers that the aliens have spent decades infiltrating human governments and businesses, and are now in the final stages of their plan to take over the planet. Erica joins the resistance movement, which includes Ryan, a Visitor sleeper agent who wants to save humanity. However, the aliens have won favor among the people of Earth by curing a variety of diseases, and have recruited Earth’s youth—including Erica’s son—to serve them unknowingly as spies.